Poor Spark?

Calipag said

Now that you mention this. I don't think there is a ground wire from the firewall. I have one from the battery to the block. One from the ignition module to the battery. One from the block ground back to the frame and one to the Rad support. But none from the engine block to the firewall.

Could it be that ?

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I don't think that has anything to do with it, for three reasons; 1) you say that you have a hot coil spark, and 2) you have plenty of redundant grounds, and 3) the distributor does not need to be grounded, only the ECU needs to be grounded, and of course the spatkplugs,lol. If she cranks, then the plugs will have adequate ground.
As to the strength of the distributor driveshaft,at the reluctor end, it is stronger than the cap or rotor, so the little knock you spoke of should be a non-issue as well.

Wataminute! How are you testing for spark at the plug wire ends, versus at the coilwire?